My gg grandfather was Reinhold Pfennighausen. Supposedly he stole this name from a neighbor when he escaped from the Prussian Army of which he was an officer. His true last name was Von Pavlokowski. He may have been a Baron. One record seems to indicate he had a wife that he abandoned in Germany who died in 1870 in Berlin. She was a baroness. Any information about either name would be appreciated. Also any ideas how to document this?